@Byron W. If you’re living in one of the properties, they most likely put you on a Home Owners policy. Depending on the carrier, the Building Personal Property is automatically calculated as a percentage of the Building Value. In this case it looks to be 70%, which is high. In our area it is usually somewhere in the 30-40% range, and then if you have items that are high value such as jewelry, equipment, etc - you’d want to list them out specifically as that can skew the numbers.
Your agent is right though -usually the only way to lower the Property Amount would to be to lower the Building Limit.
Also, very common that Replacement Costs are much higher than appraised value. What I would do is take a look at the cost per square foot of new similar type construction, to get an idea as to what the true cost to rebuild would be, if the property were to burn down completely and you had to rebuild. So if the property is 1000 square feet and new construction in your area is 200 per square foot, you should look to insure Replacement Cost around $200,000 at the minimum.